Origin of anomalous magnetite properties in crystallographic matched heterostructures: Fe3O4(111)/MgAl2O4(111)

被引：16

作者：

Gilks, D. ^{[1
]}

Lari, L. ^{[1
,2
]}

Naughton, J. ^{[1
]}

Cespedes, O. ^{[3
]}

Cai, Z. ^{[4
]}

Gerber, A. ^{[5
]}

Thompson, S. M. ^{[1
]}

Ziemer, K. ^{[4
]}

Lazarov, V. K. ^{[1
]}

机构：

[1] Univ York, Dept Phys, York YO10 5DD, N Yorkshire, England

[2] Univ York, York JEOL Nanoctr, York YO10 5BR, N Yorkshire, England

[3] Univ Leeds, Sch Phys & Astron, Leeds LS2 9JT, W Yorkshire, England

[4] Northeastern Univ, Dept Chem Engn, Boston, MA 02115 USA

[5] Tel Aviv Univ, Sch Phys & Astron, IL-69978 Tel Aviv, Israel

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2013年 / 25卷 / 48期

基金：

英国工程与自然科学研究理事会;

关键词：

RAMAN; SIMULATION; HEMATITE; BEHAVIOR; ORDER;

D O I：

10.1088/0953-8984/25/48/485004

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Magnetite films grown on crystallographically matched substrates such as MgAl2O4 are not expected to show anomalous properties such as negative magnetoresistance and high saturation fields. By atomic resolution imaging using scanning transmission electron microscopy we show direct evidence of anti-phase domain boundaries (APB) present in these heterostructures. Experimentally identified 1/4 < 10 (1) over bar > shifts determine the atomic structure of the observed APBs. The dominant non-bulk superexchange interactions are between 180 degrees octahedral-Fe/O/octahedral-Fe sites which provide strong antiferromagnetic coupling across the defect interface resulting in non-bulk magnetic and magnetotransport properties.

引用

页数：8

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